From 948f289d7756c98d21f43682c193852c039bd2b9 Mon Sep 17 00:00:00 2001
From: moisesPomilio <93723302+moisesPompilio@users.noreply.github.com>
Date: Mon, 30 Jun 2025 21:52:19 -0300
Subject: [PATCH] Fix CLN crash by waiting for block height sync before channel
 open (#527)

---
 tests/integration_tests_cln.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/integration_tests_cln.rs b/tests/integration_tests_cln.rs
index b6300576c..f77311fb2 100644
--- a/tests/integration_tests_cln.rs
+++ b/tests/integration_tests_cln.rs
@@ -64,7 +64,17 @@ fn test_cln() {
 	// Setup CLN
 	let sock = "/tmp/lightning-rpc";
 	let cln_client = LightningRPC::new(&sock);
-	let cln_info = cln_client.getinfo().unwrap();
+	let cln_info = {
+		loop {
+			let info = cln_client.getinfo().unwrap();
+			// Wait for CLN to sync block height before channel open.
+			// Prevents crash due to unset blockheight (see LDK Node issue #527).
+			if info.blockheight > 0 {
+				break info;
+			}
+			std::thread::sleep(std::time::Duration::from_millis(250));
+		}
+	};
 	let cln_node_id = PublicKey::from_str(&cln_info.id).unwrap();
 	let cln_address: SocketAddress = match cln_info.binding.first().unwrap() {
 		NetworkAddress::Ipv4 { address, port } => {